Combined type-writing and computing machine.



W. WRIGHT & 6.0. DEGENER.

COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION F|LED FEB. 2 1910- 1,237,008. Patented Aug. 14,1917.

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COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED FEB- 12, I910.

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W. WRIGHT & G. 0. DEGENER. COMBINED TYPE wanms AND COMPUTING MACHINE.

APPLICATION FILED FEB. l2. I910. 1,237,008. Patented Aug. 14, 1917.

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APPLICATION FILED FEB-12. I910.

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APPLICATION FILED FEB- 12, I910.

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APPLICATION FILED FEB- 12, I910- Pa'tented Aug. 14, 1917.

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APPLICATION FILED FEB. 12. I910.

Patented Aug. 14, 1917.

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ATTOR EY W. WRIGHT (Q G. 0-. DEGENER.

COMBINED TYPE WRITING AND COMPUTING MACHINE. APPLICATION FILED FEB-12.19I0.

1,237,0(T8A Patentefi Aug. 14, 1917.

H SHEETQ-SHEET I 0.

W. WRIGHT & G. O. DEGENER.

COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED FEB. 12, 1910.

1 237,008 Patented Aug. 14, 1917.

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UNITED STATES PAENT GFFICE. I

WALTER WRIGHT AND GUSTAVE O. DEGENER, OF NEW" YORK, N. Y., ASSIGNORS T0 UNDEB'WOOD CQMPUTING MACHINE COMPANY, OF NEW YORK, N. Y., A COEPOItA- TION OF NEW YORK.

Specification of Letters Patent.

Patented Aug. 14, 1917.

Application filed February 12, 1910. Serial lfl'o. 543,603.

To all whom it may concern: 7

*Be it known that we, WALTER WRIGHT and GUSTAVE O. Dnennnn, both citizens of the United States, and both residing in the city, county, and State of New York, have invented certain new and useful Improvements in Combined Type-Writin and Comparts when desired, without liability of disarrangement of any part. To this end, the connections from the keys to the computing mechanism include a set of hooks whlch are connected to the keys in a manner to permit them to be simultaneously released, and each key has suitable guards, to prevent accidental displacement or disarrangement of the hOOkSQWhQ'll the latter are released and the keysput in operation for typewriting alone.

Another object of the invention is to pro- I vide a checking mechanism to prevent premature reversal of the movement of any key, so constructed that it will not prove an objection when typewriting alone is being done. To this end, the checking devices are silenced whenever the from the computing me anlsm.

This result is preferably accomplished by constructing checking devices between the releasable hooks and the escapement wheel of the adding mechanism, so that the check ing devices and adding devices will be simultaneously disconnected from the keys.

Another object of the invention is to provide simple and effective means for preventing simultaneous depression of two numeral keys. To this end, the keys are connected kzlysare disconnected to a converging1 series of blades, which may be moved by t e keys to occupy a common posltion. The blades are shown converging about a common center. Each. key may move its blade to said common center at the lnitial part of the key depression. If another key is operated, its blade will strike the first operated blade. In other words each blade interferes with the operationof all the others, and hence the depression of more than one key at, a time is prevented.

It will also be understood that the blade of the operated key prevents the operation of any key until the first key is returned to normal position. These interfering blades are also releasable from the keys simultaneously with the adding devices.

It will be seen from the foregoing that each key not only interferes with the operation of the others, but cannot release the others until it is itself first fully depressed, and then restored to normal position.

Another object of the invention is to provide means to prevent the operation of any key before the escapement wheel has moved to the position determined by the last operated key, so as to prevent premature feeding of the paper-carriage that is, to prevent the paper-carriage from eing released or from starting to move while the master-wheel is operating'a computing wheel.

In the preferred manner of carrying out this part of the invention, a universal looking bar is employed to look all the keys in the typewriter; this locking bar being substantially the same thing as the line-lockin bar usually employed in an Underwoo typewriter, and bein in fact employed also for line-looking in t e usual manner. The depression of any of the numeral keys operates to set this locking bar to position to look all the keys in the typewriter; and a latch holds the locking bar in effective position.'

The depressed key operates in the usual manner to release the carriage for letterfeeding, and also operates to release the escapement wheel of the computing mechanism, so that the latter may be driven around through an are determined by the gin a line of writing and adding.

key depressed, and the master wheel turned accordingly. As the master wheel is coming to rest, it releases the latch that detains the lockin bar, and thelatter is returned to norma position by a spring. The movement of the locking-bar back to normal position leaves the way clear for the depressed key to com lete its return to normal position, and a so to release the other numeral keys from the control of the interfering blade. It will be borne in mind that reactuation of said depressed key cannot take place before it completes its return to normal position, owing to the provision of the checking mechanism above referred to.

From the foregoing, it will be understood that only one numeral key can be depressed at a time, and that it is otherwise rendered impossible for an escapement pin onsaid escapement whee to be prematurely or falsely projected to working position; and also that the carriage-feeding mechanism cannot be prematurely operated by any key of'the machine during the operation of the adding mechanism caused by a previously depressed key.

A further object of the invention is to improve the gearing connections between the constantly revolving motor and the computing mechanism. Two trains of gearmg ramify from the motor, one train extending to the master Wheel of the adding mechanism and the other train extending to the constantly revolving shaft which assists at the tens-carrying operation. The clutch between the motor' shaft and the main train of gearing is contained in a box. The latter also contains certain gears of the second train, and is designed for containing lubricant or the like.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a front view of the present improvements applied to the Underwood front strike writing machine; the arts being shown in normal positions rea y to be- Fig. 2 is a front view on a larger scale, to show the means for disconnecting the keys from the adding mechanism, and also the devices for checking the keys against premature reversal of movement.

Fig. 3 is a similar view showing the keys disconnected by the depression of thetemporary disconnecting key.

Fig. at is a plan of parts seen in Fig. 2.

Fig. 5 is a perspective view of parts seen in Fig. 2.

Fig. 6 is a part sectional plan view of the principal members of the computing mechanism; the computing wheels and carriages being omitted.

- Fig. 7 is an elevation of radially disposed jacks and the levers upon which they are mounted and by which they are caused to project or set the escapement pins upon the primary'or main escapement wheel.

Fig. 8 is a sectional elevation showing the pins in the primary escapement wheel and the four-toothed rotatable dog or pinion driven thereby. P

Fig. 9 is a perspective view of the principal members of the mechanism for enab ling the keys to control the movements of the primary escapement wheel of the computing mechanism, andalso several safety devices associated therewith.

. Fig. 9 is to be read as a part of Fig. 9.

Fig. 10 is a part sectional elevation taken from front to rear, showing connections between the motor and the computin wheel shafts and the escapement mechamsm for the computing wheels.

Fig. 11 is a sectional view taken through a lubricant box which contains a friction clutch between the motor and the computing mechanism, and also part of the train of gears running to the constantly rotating shaft which assists at the tens-carrying operation. This section is taken through the clutch.

Fig. 12 is a sectional view similar to Fig. 11 but taken at another part of the box.

Fig. 13 is a sectional elevation to illustrate the operation of the devices which enable each numeral key to interfere with the operation of all the others.

Fig. 14: is a front sectional elevation of a portion of the machine at the right of Fig. 3, and illustrating certain key-controlled devices, including the jacks for setting the escapement pins, and also the interfering blades which enable each numeral key to prevent the operation of the others. Figs. 14 and 14" show tens-carrying elements.

Fig. 15 is a detail of the connection between the platen-shifting-frame of the typewriter and the disconnectible devices which extend from the keys to the adding devices;

whereby at the shifting of said frame in one direction the keys are disconnected from the adding devices, and the connection is restored at the return movement of said shifting frame to normal position. i

Fig. 16 is a sectional elevation taken longitudinally-from front to rear of the combined typewriting and adding machine, taken about centrally of the machine.

Fig. 17 is a detail of the gear connections associated with the computing wheel carrlage.

Fig. 18 is a perspective view illustrating the secondary escapement wheel as temporarily locked to prevent the main or primary escapement wheel from rotating while the paper carriage is making its letter feedlng movement.

Fig. 18.

nae-mos B parts shown in Fig. 22 with parts broken away to show the underlying structure.

Fig. 24 is a vertical section taken from front to rear, showing the relation of the line-lock mechanism to the carriage. The locking bar of this mechanism is also used for locking the keys when a computing action has been started and before the same is completed.

Fig. 25 is a front view of the forward part of the machine, showing the line-locking device usual on the Underwood machine, which is disclosed in the Helmond Patent 775,331; and also showing a portion of the mechanism for connecting and disconnecting the computing devices from the numeral keys.

Releasable connection of nmncml keys to the adding moham'sm; platen shifting aleoices.Fixed to the forward portion of the frame 1 of the Underwood typewriting machine illustrated, is a transverse plate 2,

Figs. 1, 3 and 16 on edge, overlying the keylevers 3,"which operate the figure and letter types 3, causing them to strike rearwardly against the platen 3 journaled upon a platen frame 3, which is vertically shiftable, as usual, for writing either capitals or small letters at will. I

Secured upon the front side of said fixed plate 2 are guides 4 for a transverse horizontal sliding-bar 5, F ig'. 2 which is employed for the purpose of connecting and disconnecting the adding mechanism from the type-operating key-levers 3. Links 6, Figs. 2 and 5, are passed through holes 6 in said disconnecting bar 5, and are connected at their lower ends by hooks 7 to said key levers 3, and at their upper ends by pivots 6 to bell-cranks, which will presently be described, for controlling the adding devices.

As-seen at Figs. 2 and 5, the hooks 7 of the links 6, are normally caught between upper and lower horizontal jaws 8, 9, provided upon the numeral key-levers 3, so that when any numeral key lever is depressed, the link 6 is pulled down and the adding devices operated. By sliding the disconnecting-bar 5 to the right, the links 6 are swung free of said jaws, and the numeral keys may be depressed to cause their types to print, without adding, Fig. 3.

It will be observed that the lower jaw 9- is extended to the right, Fig. 3, far enough to serve as a guard to prevent the hook 7 from getting below the jaw 9 even when the hook is swung clear of the upper jaw 8; and the latter is provided with a vertical extension 8 of a height to correspond with the length of stroke of the key-lever 3, so that the hook 7 cannot be swung to the left over the jaw 8. Therefore, all danger of disarrangement or improper relation between the links and the levers is avoided.

The disconnecting-bar 5 may be operated in any suitable manner, as for instance in that shown in' application No. 485,030, filed March 22, 1909, whereby said disconnect1ngbar 5 is connected to the mechanism that shifts the platen frame up and down, so that no addition may be performed when the keys 3 are being used for writing upper case letters and not figures.

As set forth in said application, said bar 5 has a pin or pivot 11, engaging a slot 12 in the lower end of the upstanding lever 13, which is pivoted between its ends at 14 upon a fixed support 15 forward of and separated from the fixed plate 2 and secured thereto by suitable devices 16. It will be seen that by swinging the lever 13 to and fro, the bar 5 connected thereto may be caused to disengage and reengage the adding links 6 to the type-operating key-levers 3. As explained in said application, a slot-17 in the upper end of the lever 13 is engaged by a pin or pivot 18 extending from the upper end of the uppermost arm of a four-armed lever 19, which turns upon a central pivot 20 provided upon the support 15. The pin 18 projects through an opening 21 in said support 15, on the back side of which the lever 13 is pivoted. The. movements of the switchlever 19 are arrested by the engagement of said pin 18 with the ends of said opening or slot 21. Upon said pin 18 is loosely pivoted, by means of a hub 22, a crank or arm 23 carrying a handle 25. To the latter is attached the lower end of a draw spring 26, the upper end thereof being caught upon a fixed pin 27. Said spring holds an arm 24 (also provided upon the hub 22, Fig. 4,) up against a pin 35 projecting from the left hand cross-arm of the lever 19, and thereby holds said lever 19 in the Fig. 2 position, and the disconnectingbar 5 in position to hold the links 6 in operative engagement with the key-levers 3.

For temporarily disconnecting the adding mechanism from the keys, a key 33 is provided upon a lever 33", Fig. 2, the latter having a segment 33, to mesh with a segment 33 provided upon lever 33, whereby upon depression of the key the lever 33 is carried down, and by means of a link 32 pulls down upon the pin 29, to which its at Fig. 2 to that at Fig. 3, against the tension of the spring 26. Upon the release of the key 33 from pressure, said spring restores the parts to initial positions.

During the operation just described, the pin 29 moves in an are about the pivot 20 as if said pin 29 were fixed to the fourarmed lever 19; but it will be seen that said pin is provided upon a link 30, which is pivoted at its lower end at 31 to the lowermost arm of said four-armed lever, and that said pin 29 works in a slot 28 in said arm 24, for the purposes set forth in said application.

To'said pin 35 is pivoted the lower end of a vertical rod or link 36 carrying a lug 39*, Figs. 2 and 16, which maybe pressed down by the end 37 of a lever 38, which is connected to the frame 186 for the shifting platen frame 3 in such a manner that said lever 38 may press down the link 36 from the position at Fig. 2 to that at Fig. 3, whenever the platen frame is shifted up for writing capitals, so that at this time no adding shall be efiected. As set forth in said application, upon swinging the handle 25 to the right, the spring 26 is carried over the dead-center, and accordingly serves to hold the four-armed lever 19 permanently in the position at Fig. 3. At such time, the key 33 'will serve to return the four-armed shift lever 19 temporarily to the Fig. 2 position.

'Doable acting hey cheek-When any figure key 3 is depressed, the jaw 8 connected thereto pulls down the hook 7 and its link 6, and rocks thebell crank 39 to which said link is pivoted at its upper end, Fig. 2. It will be observed that the bell cranks 39 are pivoted upon the front side of the plate 2. Upon each bell crank is fixed a segment 40 of a ratchet; and each segment is engageable by a double-acting pawl 41 pivoted at 42 upon the front of said fixed plate 2. Each pawl is vibratable to either side of its normal position; and is held in normal position by a draw-spring 43 connected to the end of the pawl opposite its point. During the descent of a key, the pawl engages the segment 40, riding freely over the teeth thereof, but preventing return of the segment or key, as seen at the right hand por-. tion of Fig. 2. As soon, however, as the depression of the key is completed, the pawl slips off the right hand or upper end of the segment, the spring 43 returning it to normal condition, and the return of the key is permitted under the influence of its spring 102. During such return stroke, the upper end of the segment engages the pawl 41 and turns it backwardly and rides up freely past the same; said pawl now serving to prevent a second depression of the same key before the return stroke of said key is completed. Upon the key resuming its normal condition, the pawl 41 again swings clear of the radially and suitably fulcrumed at 47 upon.

an annular fixture 48. To each lever is pivoted at 49 one end of a jack 50; the other end being loosely guided in a perforation 51 in a fixed disk 52, Fig. 14.

Whenever a key is depressed and its bellcrank 39 is turned, the associated lever 46 is actuated by the link 45 to thrust the jack 50 to the right and cause it to project one of a series of movable stop teeth or pins 53 carried upon an escapement-wheel 54, Figs. 6 and 9 which controls the movements of the adding wheels. The connection of thisescapement-wheel to the adding wheels will be presently explained, as will also the connection to the motor by which it is driven forward. The general construction of this escapement-wheel and its pins is set forth in pending application No. 388,766, Figs. 8, 9 and 11. The jacks are disposed in a circle to correspond with the circulararrangement of the escapement pins 53, (returnable by a cam 53) and when any jack is advanced, it pushes the adjacent pin through the wheel, so that it protrudes upon the right hand side thereof in position to engage (or drive) a rotary four-toothed dog 55, which is fixed upon the same shaft 56 as the four-toothed secondary escapement-wheel 57. The latter is arrested bya vibrating dog 58, and thus the escapement wheel 54 is held in check. Whenever the dog 58 vibrates to release the escapement wheel 57, the fourtoothed dog 55 is rotated by the projecting pin 53 with which it is in engagement, and permits the pin-wheel 54 to rotate un il'the last projected pin thereon engages wit said four toothed dog 55, and rotates the latter until the succeeding tooth of the escapement wheel 57 engages the vibrating-dog 58. The adding wheel which is at the time connected to the escapement-wheel 54, is given a corresponding degree of rotation. When another pin 53 is protruded and the dog 58 is then vibrated, there is a further action ofthe wheel 54, dependent upon the distance of the last projected pin 53 from the pin which was projected therebefore. Accordingly, any amount of rotation can be given to an adding wheel by depressing the proper key 3 of the series.

near/nos It will be observed that said vibrating dog 58 is fixed upon a rock-shaft 59, the latter having" an upstanding arm 60 for rocking said shaft; and that said arm 60 is connected .by a link 61 to one end of a lever 62, which 68. Any of the levers 46 may engage the disk 66 to move it, and thus operate the lever 62 and the dog 58; and a spring 69 will return these parts to normal positions uponrelief of the key from pressure. The disk 66 is providedwith radial slots 7 O in which the links v45 play; and the inner end of each lever 46 may bear directly upon the universal disk or bar 66.

. Thus it will be seen that a complete vibration of the dog 58 occurs at each depressionv and release of any finger-key 3, and hence that the primary escapement wheel 54 is per-- mitted to advance a distance dependent upon the key depressed. Each lever 46 may have a heel 71 to coeperate with the fixed disk 48. to

prevent overthrow of the lever upon return to normal position. When the keys are disconnected from the adding mechanism by swinging the links 6, the spring 69, acting 'iipon the universal bar or disk 66, holds the levers 46 in normal positions, and consequently retains the links 6 at the proper height to be again swung into connection with the keys 3.

Each link 45 has on its end a crook, or is bent at right angles, as at 72, to slip through a perforation ofthe lever 46. An arm 73, Fig. 9, releasably fixed upon the rod 67 by.

means of a screw 73, prevents rotation of the rod 67 or of the disk 66 thereon; said arm 73 being confined between a bar-74 (forming part of the framework attached to the typewriting machine, and carrying the hangers 68) and one of the links 45. When it is desired to turn the disk 66, the screw 73 is unscrewed to release the rod and disk. The latter may be turned to carry the crooks 72 out of engagement with the levers 4, when disassembling the mechanism.

It will be observed among other things that the pawl 41 and ratchet 40 make it impossible for the operator to leave an escapement pin 53 projecting part way out from the escapement wheel 54, so that no error in calculation can arise from this source. It sometimes happens that an operator, in striking the. wrong key, does not notice that he has done so until the key is partly depressed. But the described construction prevents trouble arising from such false stroke,

. since the key does not return to normal posireturn to normal position. This operation of course thrusts up only one pin 53; the liability of two or more pins becoming partly projected from the wheel being avoided.

Means for enabling each fignrehey to interfere with the operation of the other figare keys.

series of diametrical slots 77 formed in one end of the fixture 52, and the points of the blades form, a circle around a small central opening 78, Fig. 14, in said support 52; and as long as said opening is occupied by a blade, no other blade can pass through said opening, as it will encounter the first blade; and hence it is impossibleto operate any of the remaining figure keys until the first key has returned to or substantially to normal osition. In other words, each key interieres with the operation of all the other keys, so that it is not practicable to depress more than one key at a time. One of the principal advantages of this device is that it prevents the operation of two keys simultaneously. It will also be seen that as soon as one key is partly depressed, it prevents the depression of any other key.

Means controlled by the primary es'eapement wheel for locking the keys.

Fixed to the shaft 59, which rocks each time that any figure key is depressed, is an arm 79, which is operatively connected to a bar 80, Fig. 9, to swing the latter forwardly beneath hooks 81, Fig. 5, provided upon the key-levers. This is part ofthe well-known Underwood line-lock mechanism disclosed in the patent to'Helmond; 775,331. To 0perate the same, the carriage is provided with a lug 240, whiclnat the end pf a typewritten line,'enga ges an extension 241 on a bell-crank 242 to rock the latter. The other arm of this lever is provided with a pivoted dog 243, which rocks an arm 244 secured to a rock shaft 245 on which standards 88 are also secured. These standards 88 carry the lock bar 80. The connection includes a link 82 pivoted at one end to a head 83 provided upon one end of a rod 84, the latter being pivoted at 85 to an arm 86 of a bell-crank, and the bell crank having an arm 87 to engage one of a pair of rocking standards 88 carrying one end of said locking bar 80. Said arm 86 may be connected by a link 89 to an arm 90 of another bell crank (Fig. 6) the latter having a pin 91 to engage directly with the bar 80, to help swing it forwardly. When a key is depressed, the shaft 59 rocks and pulls the link 82', and, through t ev the desired adding wheel during the operathe rod 84 and the bell cranks rocks locking bar 80 forwardly beneath the keylever hooks, so that no other key can be depressed. At the same time, a latch 92 (Fig. 20) is snapped by a spring 93 up into a notch 94 formed in the head 83, whereby the locking bar 80 is mechanically maintained in efiective position, so that the keys cannot be unlocked until said latch 92 is released, even should the operated key rise againin the meantime. The latch 92 is releasable by means of an arm 95 fixed to a rock-shaft 96 upon which the latch is mounted; and the release may be efi'ected'by any of the teeth of the secondary escapement wheel 57 striking up the'arm 95, .and causing the latch 92' to drop from the notch 94. The parts are so constructed that this release takes place only when the primary ,escapement. wheel 54 has come to rest or nearly so. Hence the keys remain locked until the primary escapement wheel has about completed its operation, so that it is impossible to operate any of the jacks 50 prematurely, and thereby cause the spurious projection of one or more of ,the escapement pins or teeth. 53; so that liability is avoided of the'escapement wheel acting erroneously at the succeeding operation.

Amon other things it will be noticed that when a ey is depressed it cannot return to normal position in advance of the return of the locking bar 80 to normal osition, and

hence the pawl 41 prevents the toy from being operated a second time prior to the conclusion of the stroke of the escapement 57, which releases the latch 92 and permits the locking bar 82 to release all the keys includ-' ing the one operated. Hence the computing mechanism cannot be prematurely operited either by the depressed key or any other It will be understood that the escapement wheel 57 which controls the dog-56, is not.

fully released until the return stroke of the universal bar 66, that is, until the key starts upon its upward stroke; and that the operation of the primary escapement wheel 54 must take place thereafter and before the next key is depressed. Since all the keys operate the carriage-escapementmechanism,

(that is, the dogs which control the step-bystep letter-feeding movements of the paper carriage), and since it is desired to prevent remature operation of said dogs, and hence insure that the paper carriage shall remain stationary during-the operation of the pri-v mary escapement-wheel 54,. it will be seen that all of the keys are locked by the bar 80; and hence the master wheel (which is controlled by the esca ement wheel 54 and engages the adding w eels in succession at the stez h'y st'ep movements of the paper carriage) is maintained in engagement with per carnage.

Uamiagefeeding devices and means to avoid rotation of the primary eseapement wheel of the adding mechanism while the carriage is feeding.The figure keys 3 and the letter keys 100 are, in the Underwood machine, mounted upon a fulcrum rod 101 and held up in normal "positions by returning springs 102, Fig. 16. Each of the key-- levers is connected by means of a sub-lever 103 to a type bar 104 which strikes against the front side of platen 3". Upon each type-bar is a heel 106, which engages and presses backwardly a universal bar frame 107, and the latter in turn actuates a dog rocker 108 having fast and loose dogs 109,

110 for alternate engagement with an esvcapement wheel 111; the latter mounted upon a shaft, upon which is also mounted a p1n1on 113, to mesh with a rack 114 mounted upon a paper-carriage 115. When a figure key is depressed, the arm 60, Fig. 9, is swung over to the position at Fig. 20, and the active tooth of the secondary escapement wheel 57 slips oil the dog 58 and engages a dog 116, which is rigid with the dog 58; said dog 116 serving for temporarilv detalning this escapement wheel 57 until the return to or nearly to normal position of the arm 60, whereupon the wheel 57 escapes from the detent or dog 116, and the movement of the primary escapement-wheel 54 is permitted.

' It will beseen that the heel 106 on the type bars releases the universal bar 107 durmg the initial art of the return stroke of the type bar. ence near the beginning of the return stroke of the arm 60, Fig. 20, the paper carriage 115 is released for its letterfeeding movement.

A latch 117, Figs. 9 and 20, is pressed by a spring 118 into position to engage a og 119 formed on the arm 60 when said arm has returned partly to normal position. Normally the latch is held back by a curved edge 120 formed on the arm 60; but upon the initial stroke of said arm 60, the spring 118 snaps the latch into position, (without preventing the completion of the initial stroke of arm 60) and at the same time snaps a pallet 121, Fig. 21, into one of the notches between the teeth of the escapement wheel 111; said latch being connected to said pallet by means of a rod 122, a lever 123, and a link 124. This pallet is designed to be engaged and to return to normal position by the succeeding tooth of the es capement wheel 111, which is turning in the and the dog'llG Wlll permit the escapement of the secondary wheel 57 and the latter may be freely driven by the projected escapement tooth 53 on the rimary wheel 54. This movement of the primary escapement wheel 54 takes place when the paper-carriage is at rest or approximately in its arrested osition.

Addmg wheels, adding-wheel carriage, and motor for rotating the adding wheels. The adding wheels are seen at 125 mounted in a carriage 126 connected by lugs 127 to the typewriter carriage 115, Fig. 16. The shaft which turns the adding wheels is designated as 128, and may be constructed and operated in the manner set forth in said pending application No. 485,030 filed March 22, 1909. Said shaft is rotated by means of a motor 129, Figs. G and 10. The shaft 130 of the latter is constantly in rotation and carries a friction clutch comprising spring arms 131 and centrifugal shoes or clutches 132 thereon, Fig, 11, the latter bearing upon the interior of a friction clutch drum 133,

to which is fixed a bevel pinibn 134. With said pinion meshes a'bevel pinion 135 upon a shaft 136 carrying at its other end a bevel pinion 137. The latter meshes with a bevel pinion 138, and to this is fixed a pinion 139 meshing with a pinion 140, which is fixed to the primary escapement wheel 54, whereby the train of gears, just described, is held stationary, together with the drum 133, during the rotation of the motor 129, until'the escapement wheel ispermitted to turn. in the manner already described. The connection to the adding wheels includes a pinion 141 meshing with 138 and carried on the same shaft 142- with a pinion 143; andthe letter meshestvith a pinion 144 on a vertical shaft 145.

7 By means of a clutch 146, Fig. 10, controlled by a lever 147, either of two pinions 148, 149, on said shaft 145, may be caused to turn a pinion150 on said shaft 128. By shifting the clutch theshafi'. 128 may he turned either forwardly or backwardly, so that the adding wheels may operate ineither direction for either addition or subtraction as may be required. The shaft 128 extends through a tube 151 and carriesat its end a master wheel 152, the teeth of which project from the tube and engage internal teeth 153, which may ride uponfsaid tube 151 and upon another tube or shaft 152* in line therewith. Said teeth 153 are formed upon gears 154, which. are also housed in the carriage 126 and mesh with gears 155 provided. upon the adding wheels 125,

Meshing with each gear 154 is a pinion 156, to which is connected a scalloped wheel 157 (Fig. 14") engaged by a sprung-detent roll 158. Each gear 154 carries a special tooth 159 (Fig. 14), which once in every revolution (at the tens-carrying operation) engages a five-toothed pinion 160 provided upon the succeeding pinion 156, thereby j turning the next gear 154 with its adding wheel 155. At this-operation one of the teeth of the wheel 157 engages a soft rubber lower end a pinion 167, to mesh with a pinion 168 on a shaft 169, the latter having at its other end a bevel pinion 170, to mesh with a bevel pinion 171 provided upon a short horizontal shaft 172, which is eonnected by pinions 173, 174 and 175, Fig. 12, with the constantly rotating motor shaft 130. It will be noticed that-the pinions 173, 174 and 17 5, together with the clutch devices 131, 132 and 133, are contained in a closed case 176, the cover 177 of which is detachably secured by screws 178, so that the box may be opened for introducing lubricant or the like, or suitable material withwhich the box may be filled.

It will be seen that the clutch lever 147 is also connected to a clutch 17 9 for operating the pinion. 163 by either pinion 164 or 165, so that the motion of the rubber-roll 161 may be reversed to correspond with the addition or subtraction action of the adding wheels.

0pe'mtz0n.--The motor 129 having been set in operation, whereby the tens carrying write the desired numbers, each key operating through an elbow lever 103 to throw the type bar 104 up to print.

The heel 106 upon the type bar pushes back the universalbar 107, and the latter moves the dog 110 out of engagement with the carriage escapement wheel 111, and the dog 109 into engagement with said wheel; the dog 110 making its usual stepping movement to position to engage the succeeding notch in the escapement wheel 111.

During said downward movement of the key, the link 6 is pulled down, the bell crank 39 is rocked, and the link 415 pulled to the left. This rocks the lever 46, throwing the blade 75 into position to intercept any of the remaining blades. At the same time the jack 50 thrusts one of the escapement pins 53 toward the right, so that the latter is projected into the path of the four-toothed rotary dog 55.

At the same time the lever 16 presses the universal disk 66 toward the left, at Figs. 1 and 6, thereby vibrating the lever 62, and through the link 61 rocking the arm 60 from the position at Fig. 9 to the position at Fig. 20. By this movement the shaft 59 is rocked,

and the secondary escapement wheel 57 of the adding mechanism escapes the dog 58 and engages the dog 116.

At the same time the arm 79 upon said rock shaft 59 moves the head 83 and link 8 1 to turn the bell cranks 86, 87, 90 and 91 (Fig. 6), to swing the locking bar 80 forwardly beneath the hooks 81 on all the key levers except the one depressed, whereby operation of the carriage feeding devices by any of said key levers is prevented. The latch 92 is snapped by the spring 93 into the notch 94 in said head 83, to hold the keylocking bar 80 in its effective position.

Upon the release of. the key from pressure, the key and type bar are returned to normal positions by the spring 102; and the universal bar and feed dogs 109, 110 are re.

turned to normal positions by the usual spring (shown diagrammatically at 180, Fi 16).

is usual in the Underwood machine, the universal bar 107 remains motionless dur ing the major portion of the printing stroke of the type bar, and is returned to normal position during the initial portion of the return stroke of said type bar to normal position. Hence the carriage 115 is released while the type is only a short distance from the platen 3".

During this initial portion of the return stroke of the key, the head 83 and the looking bar 80 remain in their effective ositions; but the arm 60 and the rock she 59 are rocked toward normal positions by springs182 and 69, Figs. 9 and 20, the pin- 97 on the arm 79 movlng freely along the slot 98 in the linkv 82,, a8 at'Fig. 18.

ing the latter part of the initial stroke of the bell crank 60, as at Figs. 20 and 21; and the hook being intended to intercept said bell crank 60 in the return movement of the latter. The spring 118 it will be understood acts upon the link 122 to move the pawl 117 to the position at Fig. 20, and at the same time vibrates the lever 123 and acts upon the link 124 to move the pallet 121 from the idle normal position at Fig. 21 to theposition at Fig. 19. Hence the secondary escapement wheel 57 of the adding mechanism is temporarily detained until said succeeding tooth of the carriage escapement wheel 111 engages said pallet 121', as at Fig. 19, and pushes the same to the position at Fig. 9. This withdraws the pawl 117 from the notch 119, and permits the springs 182 and 69 to return the bell crank 60 and the rock shaft 59 to normal position, the secondary escapement wheel 57 being thereby released, so that the projecting escapement pin on the primary escapement wheel 54.- is enabled to rotate the dog pinion 55 and escape past the same.

The escapement wheel 54: now rotates until .the escapement tooth 53 thereon, which was projected by the last depressed key, comes .into engagement with the succeeding dog of ting a spring 183, Fig. 9, to withdraw the locking bar 80 from the key hooks 81, thus releasing the keys.

It will also be understood that during the return key stroke,'the blade 75 is withdrawn from the paths of other blades, so that another key may be operated.

The original projected escapement pin 53 is returned to normal position by a stationary cam 53 (Fig. 8) during the movement of the escapement wheel.

The described movement of the primary escapement wheel 54 was effected by the m0- tor 129 through the clutch seen at Fig. 11, and the train ofgearing 13 1, 135, 136, 137, 138, 139 and 140; and a corresponding moveneevgeoa is constantly rotated by the motor 129 by means of the train of gearing including 175,

174, 173, 171, 170, 168 and 167, clutch 179, and pinion 163. Said pinion 163, Fig. 17, is fixed upon a shaft 188, which is ournaled on a fixture 189, Fig. 16, and carries a gear 190, in mesh with which is a pinion 191.

The latter is mounted upon a shaft 192, which may be square in cross section, to fit a bore in a sliding pinion 193, Figs. 1, 16 and 17, which is mounted upon the computing wheel carriage 126 and meshes with a pinion 194, fixed upon the shaft which carri es the revolving soft rubber roll 161. Said carriage 126 has rolls 183 whereby it runs on a rail. 183

Whenever the platen shift key 184 is depressed, (Fig. 16), its elbow-like lever 185 presses forwardly an arm 186 of a frame which carries a shift rail 187 and the latter lifts the platen frame 3 and platen 3 in a well-known manner- Extending forwardly from this shift frame is the arm 38, having the car 37 to press down the rod 36, thereby moving the parts to the position seen at Fig. 3, to disconnect the keys from the adding mechanism.

Reference is made' to co-pending applications of Walter Wright, Nos. 388,7 66, 428,020, and 485,046, and of Walter lVright and Gustave O. Degener, No. 485,030; no claim being made herein to any of the inventions disclosed in any ofsaid applications. The claims in this application are limited to improvements which are not shown in any of said applications.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others, as for instance certain of the computing devices may be employed independently of the typewriting mechanism.

Having thus described our invention, we claim:

1. The combination with addin devices, of type-operating levers, releasa le links connecting said levers to saidadding de-- vices, each lever having upper and'lower jaws, and the links having hooks between the jaws; guards being provided to prevent the hooks from getting below the lower aw. J 2. The combination with adding devices, of type-operating levers, releasable links connecting said levers to said adding devices, each lever having upper and lower jaws, and the links having hooks between the aws; guardsbeing provided to prevent the hooks from being swung to positions directly over the upper-jaws.

3. The combination with adding devices, of type-operating levers, releasable links connecting said levers to said adding devices, each lever having upper and lower jaws, and the links having hooks between the jaws; guards being provided to prevent the hooks from getting below the lower jaw, and guards being also provided to prevent the hooks from being swung to positions directly over the upper jaws.

4. The combination with adding devices, of type-operating levers, releasable links connecting said levers to said addin devices, each lever having upper and lower aws, and the links having hooks between the jaws, the lower jaw being extended to form a guard to prevent the hook from getting below said jaw; and the upper jaw being extended upward to form a guard to prevent the hook from being swung directly over said upper aw.

5. The combination of type-operating keys, computing mechanism including adding wheels and a master wheel therefor, bellcranks or levers releasably connected to said keys, means operated by said bell cranks for controlling the movements of said master-wheel, segments upon said bell cranks, and pawls to engage said segments to prevent premature reversals of the key movements.

6. The combination with a set of keys, of a set of radiating levers connected thereto, a master wheel, computing wheels controlled by the master wheel, means to enable said levers to control the movements of said master wheel, and blades provided upon said levers and radiating about a common center and movable by said keys to a central position to enable each blade to intercept the remaining blades.

7 The-combination with a set of type-opcrating figure keys and computing mecha nism controlled by said keys, of a set of interfering devices connected to said keys, one interfering device to each key, said interfering devices constructed to cooperate with one another to prevent the operation of two keys at the same time, and means to release the keys from said computing mechanism and said interfering devices. I,

8. The combination with a set of keys, of

a set of radiating levers connected thereto,

a master wheel, computing wheels controlled by the master wheel, means to enable said i levers to control the movements of said master wheel, blades provided upon said levers and radiating about a common center and movable by said keys to a central position to enable each blade to intercept the remain- 

